问题
选择题
The couple finally bought the house they wanted, for they______enough money.
A．had saved
B．were saving
C．would save
D．were to save
答案
答案：A
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The couple finally bought the house they wanted, for they______enough money.
A．had saved
B．were saving
C．would save
D．were to save
答案：A
的通项公式为（）。